Calcite with sand inclusions

Bellecroix, Fontainebleau, Seine-et-Marne, Île-de-France  France

Specimen size: 3.5 × 2.5 × 2.1 cm = 1.38” × 0.98” × 0.83”
Main crystal size: 3.5 × 1.7 cm = 1.38” × 0.67”